OTTAWA - The tongue-in-cheek nickname for the omnibus Conservative budget bill is "the omni-mess" — an opposition sobriquet to describe 400-plus pages of legislation that make widespread changes to almost every facet of Canadian life.

But the term has also been sneaking into Tory vocabulary of late as the government finds itself buffeted by unanticipated political turbulence from the Jobs, Growth and Long Term Prosperity Act, also known as Bill C-38.

For the opposition parties, a marathon vote on more than 800 proposed amendments that won't end until sometime Thursday night is an effort to prevent the government from sweeping the mess under the rug.

By 9:30 p.m. Wednesday evening, the laborious process of reading the motions into the record was well underway, a dirge expected to take at least two hours. MPs had begun filling their seats in the Commons, carrying plastic bags filled with junk food and IPads loaded with the latest TV shows to keep them busy during an anticipated 24-hour-plus voting run.

An already long haul was stretched out even further by a series of Liberal motions, designed to ensure one of their private members' bills would be dealt with before the budget amendments hit the floor.

Thus, as a prelude to the main event, the Conservative majority voted down an NDP motion aimed at making Canada meet the international 30-minute standard for search-and-rescue response times. Some Tories, however, joined with the opposition to pass a Liberal motion requesting a finance committee study of income inequality.

And just to add to the day's frenzy, Speaker Andrew Scheer ruled Wednesday evening that MPs were not "impeded in the fulfillment of their parliamentary duties" by government stonewalling on the budget bill's impact. The NDP had argued the Conservative refusal to detail cuts to public service jobs and programs was a breach of privilege.

It's all in the name of democracy, opposition MPs argued.

The budget legislation — which alters everything from the age Canadians will receive Old Age Security to environmental regulations, spy agency oversight and cross-border policing, to name just a few items — hasn't received the detailed study such enormous changes require, they said.

"We are facing a government that does not respect this institution," said NDP Leader Tom Mulcair.

"The reason we are elected is to look at the laws carefully and they are refusing to allow us to have a serious look at this bill."

Their criticisms were echoed by a series of protests taking place across Canada, including on the steps of Parliament Hill.

About 100 people gathered beneath the Peace Tower, one sign reading: "Good friends know how to split a bill."

The government has insisted it needs each and every legislated change to follow through on its promise of job creation and economic growth.

"We live in a global economy and global events will affect us here, so we need to have the tools to continue to keep Canada strong," said Finance Minister Jim Flaherty.

"We need to get the right balance of appropriate resource regulation, sustainable social program and job creation and, of course, fiscal sustainability."

The government refused repeated requests from opposition parties to break up the bill into more manageable sections.

"By refusing to compromise, the Conservatives are setting a dangerous precedent," said Liberal House leader Marc Garneau.

"This budget bill goes too far and the Liberal party is using all the tools at our disposal to fight this government's bully tactics."

When the dust settles, the Tories may have a mess of their own to clean up. Party insiders say the government has been getting an earful from constituents who are complaining not only about the major policy changes in the bill, such as streamlining the environmental assessment process and raising the age of OAS eligibility, but the omnibus nature of the bill itself.

The push back is unexpected, the insiders say, given that the Conservatives have used omnibus bills with increased frequency and little sustained resistance since they took power in 2006.

They've been deployed for legislation linking together a series of similar bills, like crime, and for budgets.

The 2010 budget implementation bill, for instance, weighed in at more than 800 pages.

It's about time for some resistance, argued political science professor Ned Franks, who has kept a watchful eye on budget implementation bills in particular.

He said they've increased from 36 pages on average from 1994-95 to 692 pages in 2010-2011.

In addition to the page lengths, the budget bills have taken to adding "and other measures" to their formal titles, Franks noted.

"Not only are recent ones far longer than those of the past, they make no pretence of being limited to subjects actually mentioned in the budget speech," he said.

It's reducing the role of MPs to little more than a rubber stamp, he said, as they don't have enough time to fully study the bills at hand.

"I was hoping that the Haper government, once it had a majority and knew it could get stuff through, would stop using what I consider an abuse of parliamentary procedure," Franks said.

"They haven't, so we're now in a position where there is a majority government that can cram it through and the opposition has woken up to this and is squawking when they can't do anything."

The government argues the omnibus bills help streamline the legislative process.

They also offer the strategic bonus of allowing a government to focus its offence and defence entirely on a single major bill, rather than being forced to face a political firing squad on multiple pieces of legislation.

Whether the omnibus strategy remains part of the Conservative playbook will likely be part of upcoming strategy talks for the fall session, when another budget implementation bill is due.

The New Democrats say they won't be letting the issue rest.

"We're going to stand up to the Conservatives. It will be a long and difficult process," Mulcair said.

"But even if the result under a majority is already pre-determined, the actions being taken by a Conservative government will have long-term consequences."

On Wednesday night, however, the focus for all parties singular: getting through the voting marathon. With no less than 67 and no more than 159 individual votes scheduled, MPs likely will need to stay in or close to their Commons seats until well into Thursday evening.

The opposition is mindful that if the Conservatives allow their attention to falter in the Commons, some amendments could pass.

"You won't see every single one of us during the 25 or 26 hours of voting; that would not be the best use of our resources," said Mulcair.

"But the majority of us will be there at all times."

The Tories have divided their caucus into 11 groups, with 10 required in the Commons at all times. Each group will get a 30 minute break roughly every five hours.

Notwithstanding the voting showdown, the budget bill will eventually pass, given the Conservatives have a majority of the seats in the House of Commons. It is scheduled to get third reading on Monday before it goes to the Senate.

"You just work in shifts, it's the only way you can do it." -- Finance Minister Jim Flaherty
Finance Minister Jim Flaherty appears during a news conference at the House of Commons on Parliament Hill in Ottawa, Ontario, on Monday, May 14, 2012. (AP Photo/The Canadian Press, Sean Kilpatrick)

"I'll be bringing work, constituency work. I'll have my laptop so I'll be using every minute ... it will go by pretty quickly I think." -- NDP MP Peter Julian
NDP MP Peter Julian rises to debate the federal budget in the House of Commons in Ottawa, Tuesday April 3, 2012. THE CANADIAN PRESS/Adrian Wyld

"I'll be paying attention. It's going to be a long night. I've got work to do." -- NDP MP Charlie Angus
NDP MP Charlie Angus speaks during Question Period in the House of Commons on Parliament Hill in Ottawa on Thursday, February 16, 2012. THE CANADIAN PRESS/Sean Kilpatrick

"I tried to get the longest sleep of my parliamentary career last night ... I think we're just going to try and keep calm, keep focused and probably crack a few jokes here and there." -- NDP MP Andrew Cash
NDP MP for Davenport Andrew Cash during Question Period in the House of Commons on Parliament Hill in Ottawa, Monday June 6, 2011. THE CANADIAN PRESS IMAGES/Adrian Wyld

"Drink lots of water, stay hydrated. Well, not too much water, you don't want to have to leave. I drink coffee to stay awake, and don't eat too much." -- NDP MP Peggy Nash
NDP MP Peggy Nash rises during Question Period in the House of Commons in Ottawa, Tuesday April 24, 2012. THE CANADIAN PRESS IMAGES/Adrian Wyld